Siemens 6ES7211-1HE40-0XB0 SIMATIC S7-1200 CPU 1211C DC/DC/Relay 6DI/4DO/2AI Programmable Logic Controller

The Siemens 6ES7211-1HE40-0XB0 is a SIMATIC S7-1200 CPU 1211C compact controller with DC/DC/relay I/O: 6 digital inputs, 4 relay outputs (2 A), and 2 analog inputs (0-10 V). It runs on 20.4-28.8 V DC, holds 75 KB of program/data memory, and communicates over a single PROFINET interface supporting IO controller, IO device, and OPC UA server functions.

Technical Specifications

Certifications & Standards

• CE
• UL
• cULus
• FM
• RCM
• KC
• Marine

Selection Notes

The relay outputs on this DC/DC/Relay variant switch up to 2 A resistive or 200 W lamp loads directly, including AC loads, which a transistor-output CPU of the same family cannot do without an external relay - pick this variant when the application drives contactors, indicator lamps, or small AC loads straight from the CPU. With 6 DI, 2 AI, and 4 relay DO built in, the 1211C covers small standalone machines; applications needing more onboard I/O call for the higher-tier CPUs in the same family. The single PROFINET port doubles as IO controller and IO device, so this CPU can run as a PROFINET master to remote I/O or as a device under a higher-level controller.

Applications

Suited to small standalone machine control, packaging, and utility skids where a handful of digital I/O and one PROFINET network connection are enough, and where outputs need to drive AC contactors or pilot lights directly from the CPU relay outputs.